feat: add wagon usage computation and maintenance logging features

- Implemented  utility to calculate wagon usage metrics for train schedules.
- Created  for sending wagons to maintenance with optional notes.
- Added unit tests for train builder maintenance functionalities, including formatting train run labels and building maintenance notes.
- Developed  component for merging train schedules with detailed previews and reasons for merging.
- Introduced  component for selecting wagons with search functionality and selection limits.
- Created  for displaying and filtering audit logs, including detailed views of individual log entries.
- Added  for handling API interactions related to audit logs, including fetching logs and entity types.

apps/edr-freight-web/backoffice/src/components/bookings/detail/BookingSchedulingWindowCard.tsx

@@ -142,6 +142,21 @@ export function BookingSchedulingWindowCard({
     schedule?.reference ??
     (schedule ? "Assigned train" : null);
 
+  // Before the batch engine allocates, the only train on the booking is the one
+  // the customer picked at day-commit — staff review that during Operation
+  // Review, so it is labelled as a request, not as a confirmed allocation.
+  const isRequested = schedule?.isRequested === true;
+  const trainRowLabel = isRequested ? "Requested train" : "Scheduled on train";
+
+  // A train that has already left (or is past its planned departure) can no
+  // longer carry this booking, so accepting onto it would be wrong. Called out
+  // here because this card sits above the staff-actions toolbar.
+  const departureIso =
+    schedule?.actualDepartureAt ?? schedule?.scheduledDepartureDate ?? null;
+  const hasDeparted = schedule?.actualDepartureAt
+    ? true
+    : departureIso !== null && new Date(departureIso).getTime() <= nowMs;
+
   return (
     <SectionCard
       icon={CalendarClock}
@@ -153,7 +168,7 @@ export function BookingSchedulingWindowCard({
       <Stack gap="sm">
         {trainLabel ? (
           <Row
-            label="Scheduled on train"
+            label={trainRowLabel}
             value={trainLabel}
             hint={
               schedule?.reference && schedule.reference !== trainLabel
@@ -163,13 +178,21 @@ export function BookingSchedulingWindowCard({
           />
         ) : (
           <Row
-            label="Scheduled on train"
+            label={trainRowLabel}
             value="Not yet allocated"
             tone="muted"
             hint="The booking has not been placed on a train schedule"
           />
         )}
 
+        {isRequested && trainLabel ? (
+          <Text size="xs" c="dimmed">
+            {hasDeparted
+              ? "This train has already departed — accepting the operation will not place the booking on it."
+              : "Picked by the customer at day-commit. Accepting the operation releases the booking to the batch pool for this train."}
+          </Text>
+        ) : null}
+
         {schedule?.status ? (
           <Group justify="space-between" wrap="nowrap">
             <Text size="sm" c="dimmed">
@@ -231,10 +254,15 @@ export function BookingSchedulingWindowCard({
                 formatStamp(schedule.scheduledDepartureDate) ??
                 "—"
               }
+              tone={isRequested && hasDeparted ? "danger" : undefined}
               hint={
                 schedule.actualDepartureAt
                   ? `Actual · planned ${formatStamp(schedule.scheduledDepartureDate) ?? "—"}`
-                  : "Planned"
+                  : departureIso && !hasDeparted
+                    ? `Planned · departs ${formatRelative(departureIso, nowMs)}`
+                    : hasDeparted
+                      ? "Planned — already past"
+                      : "Planned"
               }
             />
             <Row